Press.



F. J. PERKINS, DEUD. s. J. P. SMITH, ADMINISTRATRIX.

v PRESS.

APPLIUATION FILED MAR. 3, 1913.

' 1,1 1 5,01 3. Patented 001.27, 1914.

8 SHEETS-SHEET 1.

WITNESSFS: 4 [NVE/V701?.

ATTORNEY.

P. J. PERKINS, DEGD. s. J. P. SMITH, ADMINISTRATRIX.

PRESS.

APPLIUATION FILED MAB. a. 1913.

` Patented Oct. 27, 1914.

3 SHEETS-SHEET 2.

ATTORNEY.

F. J. PERKINS, DEC'D. s. J. P. SMITH, ADMINISTRATHIX.

PRESS.

APPLICATION FILED MAR. 3, 1913.

` Patented 0013.27, 1914.

3' 3 BBTVSHEET 3 m m4) kt Jrwun JPfr/Ms JM/ru,

minis-Mix l @am/mm A TTORNY.

.Patent No. 981468 issued Jan. 10, 1911, and

Von by a suitable clutch, not shown, but

UNITED smiles PATENT carica.

FRANKLIN J. PERKINS, DECEASED, BY SYVILLA J. PERKINS SMITH, ADMINISTRA- TRIX, OF PEABODY, MASSACHUSETTS, ASSIGNOR T0 HOLDER-PERKINS COMPANY, OF WOBURN, MASSACHUSETTS, A CORPORATION 0F MASSACHUSETTS.

PRESS.

Specification of Letters Patent.

Patented Oct. 27, 1914.

To all whom t may concern Be it known that I, SYVILLA J. PERKINS SMITH, a citizen of the United States, and a resident of Peabody, in the county of Essex and State of Massachusetts, administratrix of the estate of FRANKLIN J. PERKINS, late a citizen of the United States, deceased, believe that the said FRANKLIN J. PERKINS did invent an Improvement in Presses, of which the following description, in connection with the accompanying drawings, is a speciication, like letters on the drawings representing like parts.

This invention relates to a power operated press, such as shown and described in U. S.

has for its object to improve the same in certain features as will be described.

Figure 1 is a side elevation of a power operated press embodying this invention. Fig. 2 a view like Fig. 1 with parts in section.4 Figi 3, an opposite side elevation of the press in its open position. Fig. el, a detail to be referred to, and Fig. 5 a detail of the safety valve shown in Fig. 2.

The construction of the power operated press herein shown is in the main the same as that shown and described in the patent referred to, to which reference may be had for a full description of the same.

The press is provided with a lower platen a supported upon a piston or ram Zr located in a cylinder c and movable by fluid pressure admitted into the lower end of said cylinder. The lower platen a cooperates with an upper platen al secured to a lever e, which is operated from a crank shaft f by a crank g, link t and toggle levers z', j. The crank shaft j is driven from a main shaft 10 by a large gear 12 and pinion y13. The upper platen d is lowered into its operative position when the toggle levers i, j are straightened as shown in Fig. 1, and is raised into its inoperative position whenl the toggle levers are broken as shown in Fig. 3. The main shaft 10 is provided with a driving pulley 14, which is normally loose thereon and is designed to be rendered fast therewhich may be of any suitable construction and whose movable member is operated bv a. forked arm 15, see Fig. 2, fastv on an upright rock shaft 16, suitably supported by the framework of the press and provided at its lower end with a bevel gear 17, which is engaged by a segmental gear 18 fast to a lever 19 mounted on a pivot Q0. The lever 19 constitutes the stop lever for the crank shaft and is provided at one end with a slot 21, which is engaged by a roller 22, carried by a bell crank lever 23, whose short arm is joined by a link 2r-L with a foot treadle, Q5, provided with a counterweight 9.6.

The slot 21 in the stop lever is upwardly inclined, so that, when thc foot treadle is dcpressed, the roller 22 will turn the stop lever so as to withdraw a finger 27 thereon, from a notch 28 in the periphery of a disk 29, fast on the crank shaft f, and at the same time move the segmental gear 1S, so as to rotate the rock shaft 1G and move the clutch operating arm 15, so as to throw the clutch into its operative position and clutch the driving pulley l-'l to the main shaft 10, thereby causing the latter to turn and through the gears 13, 12 rotate the crank shaft f a half turn, so as to straighten the toggle and lower the upper platen into its operative position. As soon as the crank shaft f is set in motion, the unnotched portion of the periphery of the stop disk Q9 passes under the finger 2,7 and holds the clutch in its operative position, while allowing the operator to remove his foot from the treadle, which can be raised for a part of its upward movement by the counterweight 26.

The slot 21 is provided at its front end with a narrow portion 3() of a width substantially equal to the diameterof the roller 2Q on the lever 23, so that, when the said roller is entered into the narrow portion, the stop lever 19 is held from any material oscillation, thereby preventing accidental disengagement of the stop lever from the stop disk, by the rebounding of the finger 27 out of the notch in the stop disk, thereby avoiding accidental repeating of the press.

The lower )laten a is raised by fiuid, such as water, which is forced by a pump (not shown) through a normally open circuit of pipes, with which the cylinder c is connected, in the manner described more fully in the patent' referred to, and one of the features of the present invention consists in a novel construction of apparatus for operating the valve by which said circuit is interrupted, when it is desired to apply the fluid pressure to the lower platen. To this vend,

the stop disk 29 is provided on one face with a roller 31, see Fig. 3, which coperates with a cam surface 32 on the upper part of a lever 33, pivoted at 34-to the hollow standard or upright 35, which supports the lever e.

The lever 33 is provided with a hollow boss 36, .within which is located a helical spring 37, which is interposed between a button 38l and a bearing disk 39 which is attached to a threaded rod 40 extended through the rear wall or head of the hollow boss 36 and engaged by a nut 41 outside of said boss, The front end of the spring bears against the rear end of the buttonh38,

and normally forces the front end of the same through an opening in the front wall or head of the hollow boss 36 and against the end of a cylindrical rod 42, which constitutes a valve and coperates with a port or opening-43 in a partition wall 44 of a lvalve fitting 45, which is connected in the fluid circulating circuit.

As represented in Fig. 2, the valve fitting 45 is separated into two chambers 47, 48, which are" connected by the port or opening 43,l and the chamber 47 is provided with a fluid inlet pipe 50, which is connected with the pump, not shown, and by the branch pipe 51 with the cylinder c, and the cham- 4ber 48 is provided with a fluid outlet pipe 52, which is connected with the hollovvr standard 35 or other source of fluid supply with which the pump referred to is connected to take fluid therefrom, after the manner described in the patent referred to.

The chamber 47 is connected by the pipe 53 with apressure gage 54. The valve fitting 45 is provided with a stuliing. box 55 through which the cylindrical., valve 42 moves. The valve 42 is connected with the lever 33'to be moved thereby into its open position, and is also so connected. with said lever as to permit it to be moved into its open position independently of the said lever by an excess of Huid pressure in the. chamber 47. ln the present instance the valve 42 has attached to it a plate 60, through which are loosely extended headed bolts or screws 61, which engage threaded sockets in the hollow boss 36,'and with the heads of -which the plate 60 isnormally engaged by the spring 37, whi'ch forces the button 38 against fthe end of the valve 42. As a result, the valve 42 is capable of being moved into its open posi- Ition bythe lever 33, -whenthe latter is moved in the direction of the arrow v 64, Fig. 3, and is also capable of being moved into its closed position by the lever 33 actinsg, through the spring 37v and button 38, when the said lever is moved into the position shown in Fig. 3, and further when the valve 42 is in its closed position shown in Fig. 3, it is capable of being moved into its' open position by an excess of fluid pressnre in the chamber 47. The lever 33 is moved into what may be termed its operative position so as to close thevalve 42, by the pin or roller 31 on the stop disk 29, and is moved into its inoperative or starting position by a spring 6 6, which encircles a rod 67 pivoted at one end to the lever 33 and having it's other end extended through aJ hole in a bracket or arm 68 attached to the standard 35, and provided with a nut 69, which is normally held against the bracket by the` spring 66, which acts at one end against the bracket and at its other end against a nut 70 on the rod 67.

From the above description and by reference to Fig. 3, it will be seen, that the lever 33 which controls the valve 42 is actuated by the stop disk 29 to close the said valve, when the 4upper platen isin its operative or lowered position. Provision is also made for safeguarding the pressfrom an excessive pressure in the cylinder c, incase the valve 42 should for any reason fail to be opened by the excessive pressure. To this end, the cylinder c containing the piston or ram b has connected with it, preferably near its lower end, a valve fitting 72, seeFig. 5,

which is provided with a chamber 73,hav-

ing a fluid inlet 74 and a fluid outlet 75. The inlet 74 is connected with the cylinder c and the outlet 7 'with the atmosphere or with a suitable waste receptacle. Within 'lower platen a, said chain having its other' end connected to a removable head 80 on the reduced portion 81 of the stem 82, of. the valve 76, said reduced portion beinguencircled by a spring 83, which bears at one and at its other Lfend against a threaded sleeve or nut 85, which engages a cylindrical member 86 of a stuiiingbox, in which the spring 83 is located and between which andv the chamber 73 is a valve 7 6, which normally y end against a shoulder 84 on the valve stem,

a"coperating cylindrical member 87 is interposed' packing 88 of suitable material,

said coperating member 87 being in threaded engagement with the valve fitting 72. The valve 76 is held to its seat by the spring 83, Whose strength or compression can be regulated by the threaded sleeve 85, and any leak along the valve stem can be taken care of by means of the cylindrical member 86 of the stufling box.

When the lower platen a is in its lowermost position, the chain 77 is slack and the valve 76 is held in its closed position by the spring 83, and remains closed as long as the lower platen is below a predetermined position, and under normal conditions the lower platen is not raised to the predetermined position, for before it reaches said position, the pressure in the cylinder c reaches the point at which the valve l2 is opened, and the circuit for the fluid is opened, and the pump merely circulates the fluid and prevents the pressure increasing on the cylinlder c above the predetermined point. If,

however, the valve 42 should fail to open when the pressure reaches the predetermined point, or if, when the valve 42 is open and the upper platen is in its elevated position, the port 4.3 should be accidentally closed in any manner, the lower platen would be raised to a higher point, at which latter the valve 76 is opened, and the pressure in the cylinder isthereby relieved and prevented from increasing to the point where it would lift the platen a to a position where it would be dangerous to the press, and might break, strain or otherwise damage the same.

The upper platen ai is hollow and is supplied with steam or other fluid to heat the same, and as the upper platen is movable, provision is made for providing a supply pipe for the platen, which is 'capable of movement and yet be steam tight. To this end is employed the construction shown in Figs. 3 and Ll, wherein 90 represents the steam supply pipe, which is connected at 4its front end to the hollow upper platen (l and has its rear end in threaded engagement with a nipple 91 on a sleeve 92, which is mounted to turn on a stud shaft 93, secured at one end to a bracket 91 and having attached to its opposite end a substantially U-shaped coupling 95, to the arms of which are secured a pipe 96 leading from the boiler or other source of heat, and a second pipe 97 which may be attached to the coupling 95 and used as a water supply to cool the platen cl. In practice the pipes 96, 97 may be provided with usual shut off valves. The stud shaft 93 is provided with a central passage 98, which eX- tends from its front end toward thelongitudinal center of the said shaft and from which extends a radial passage 99, which is in open communication with an annular groove 100 on the inner surface of the sleeve, with which the nipple 91 communicates. The sleeve 92 is free to turn on the shaft 93 and is rendered steam tight at its ends by packings 101 interposed between the ends of the sleeve and collars 102 fast on the said sleeve, and into which the ends of' the shaft extend. The steam passes through the passage 98 in the shaft 93 and through the radial passage 99 into the annular groove 100, and thence through the nipple 91 and pipe 90 into the hollow platen d, from which it may pass by the pipe 103, see Fig. 1. It will be observed that when the upper platen Z is raised and lowered, the steam pipe 90 is free to move with it, as the sleeve 92 turns on the shaft 93 without danger of leakage, as the ends of' the sleeve are rendered steam tight as above described.

rl`he operation of the press may be briefly described as follows: Assume that the upper platen is in its raised position and that the operator has placed the hides, skins, leather or other material upon the lower platen, which is in its lowered position. Under these circumstances the water,oil or other iuid is taken from the hollow standard 35 by the pump (not shown) and circulated through the system of pipes back to the hollow standard, the valve L.l2 at such time being open; the roller 31 being diametrically opposite to the position shown in Fig. 2 and the stop disk 29 being advanced one half a turn from the position shown in. Fig. 2. The operator now depresses the foot treadle 25, which `carries with it the link 2l and causes the elbow lever 23 to turn on its pivot and move its long arm toward the right, viewing Fig. 2. The roller 22 carried by the lever 23 travels on the bottom wall of the slot 21 and depresses the short arm of the stop lever 19, thereby elevating the long arm thereof and lifting the finger 27 from the notch 280 in the stop disk. The movement of the stop lever causes the segmental gear 18 to rotate the pinion 17 and its shaft 16, in the proper direction to cause the arm 15- to throw in the clutch (not shown) and set the main shaft 10 in rotation. The shaft 10 through the pinion 13 and gear 12 rotates the counter or crank shaft f a half turn, and moves the roller 31 into engagement with the upper end of the lever 33, and by means of' the cam 32 of said upper end causes the lever 33 to be turned on its pivot, so as to close the valve 42 at or about the time the upper platen has been lowered into its operative position shown in Figs. 1 and 2, which is effected by the crank g connecting rod h and toggle z', j, which latter is brought into its straightened position shown in- Fig. 1. When the toggle is straightened, the notch 28 in the Sap' disk is brought beneath the anger er on the stop lever, which is moved into the same by the spring 281, inasmuch as the operator removes .his foot from the treadle.

. Ator about'the time the lupper platenl has been lowered into its operative position, the valve 42 is closed; the circuit of the water or otheruid is interrupted and the fluid taken from the supply by the pump, is forced by the .latter through thev pipe 51 into the cylinderJ c and acting on the piston -b raises the lower platen and moves the same toward the now stationary upper platen and compresses the workbetween the said platens.

l yan j the finger 27, which drops therein and holds.

moved by its spring 66' The Work is designed to'be subjected to a predetermined pressure, so that all the work of the same kind or class may be uniformly treated, which is eected bv adjusting the pressure of the spring 37 .by means of the nut 41, so that this spring pressure Will be bvercome by the fluid pressure, when the latter reaches a'pred'etermined amount, and the valve 42 will be o ened by the fluid res- -sure to reestablish t e circuit of the duid, and thereby prevent the pressure inthe cylinder from being increased beyond the predetermined point, by the pump, which continues in operation. When it is desired'to open the press, the operator again depresses the ,foot4 treadle and causes the crank shaft f to make a half turn and remove the roller 31 from engagement with the lever 33, and at the same time bring the notch 280beneath the upper platen in its open position into which it has been brought lby the 'crank g, and connecting rod la, moving the toggles i jinto s soon as the roller 31 is removed lfrom engagement with the'lever 33,y the latteriis so as'to open the valve 42-as above described.

By reference to Fig.

y. .adjust the spring substantially in an instant f by turnmgthe nut 41 without the necessity the broken position shown in Fig. 3."

2, it will be seenv that' the means for adjusting` the strength of the combination, a cylinder, a piston ltherein movable by fluid pressure admitted into said cylinder, va platen carried by said piston, a

valve for automatically controlling-the pressure of the iiuid in said cylinder, a lever, means for connecting said valve with said lever to permit the valve to be moved by said lever and to permit the valve to be moved independently of said lever,'a second platen coperating with the rst mentioned platen, a lever carrying said second platen, a rotatablev shaft, means for connecting said shaft with the lever carrying the second platen, and a device on said shaft coperating with the lever connected with said valve, substantially as described.. i.

42,. ln a machine of the class described, in combination, a platen, a lever carrying said platen, a crank shaft, mechanism connect- ,ing said crank shaft with said lever, a stop mechanismA connected with said stop mechanism, a

85 for Said crank shaft, a treadle driving shaft, means for yconnecting said Y driving shaft with said crank shaft, a clutch member 'controlling rotation of said driving shaft, a rotatableshaft to which said clutch member is connected and gearing, connecting said rotatable shaft with said stop mechanism to be operated thereby when the latter is operated by said treadle, substantially as described.

3. 'In a machine ofthe class described, in combination, a platen a lever carrying s'aid platen, a rotatable shaft, mechanism -connecting Ysaid rotatable shaft with said lever,

a notched disk on said shaft, alever having afinger on one .arm to enter the notch in said disk and wprovided with a'slot in the other arm, a pin extended into said slot, a

ltreadle, and means for connecting said pin with said treadle, substantially as described. 4. ln a machine of the class described, in combination, a platen, a lever carrying said platen, a rotatable shaft, mechanism connecting said rotatable shaft with said lever, a notched disk on said shaft, a lever having a .finger on one -arm to enter the notch in said disk and provided with a slot in the other arm, a pin extended into said slot, a

treadle, and means for connecting said pinA With said treadle, said slot having a narrow portion in which the pin 1s enteredwhen 4the said finger engages the notch in said disk,

Afor the purpose specified.

5f ln a machineof the class described, in

lac

combination, `a cylinder, a piston therein moyable by Huid pressure admitted into said cylinder, a platen carried by said piston, a valve ttingl connected with said cylinder and having. a valve controlling the flow of` fluid through said fitting, al lever connected with said valveto move the latter and to permit the valve to bemoved independently .ofthe saidlever, said' lever-having a. cham'- ber, a spring located in said 'chamber and 'iso acting on said valve, and an adjusting device for said spring accessible from outside of said chambera means to move said lever 1n name to this specification in the presence of two subscribing Witnesses.

SYVILLA J `PERKIN S SMITH,

one direction to close the valve, and means Adfm/m'szf'ratfm of estate of Franklin J. P61'- to move the said lever in the opposite direction to open said valve, substantially as described.

In testimony whereof, I have signed my cz'ns, deceased. Wltnesses:

S. HOWARD DONNELL, CHARLES J. POWELL. 

